Back when I created this mod I looked over the files but found nothing regarding SPQR priority and SPQR member generation. Without a doubt it’s somewhere but idk where. I might return to Rome TW at some point and look over the files again but I’m not sure when. In fact, I have a massive mod that’s I left mid-development but it’s been sitting there for over a year now because of the sheer amount of work required

You’re most likely having a really unlucky game. However, there are some things I would like to outline:
1) The Senate positions, just like irl, have prerequisite senate positions. What this means is you can’t just skip to Consul(SPQR can because they cheat senators out of nowhere if none are available)
2) Senate elections are affected by a variety of factors(difficulty, influence, Senate popularity, traits, retinue, … possibly more)
3) At the same time they are biased towards SPQR. Firstly, because of automatic filling of offices with SPQR members at the start(which means they are more likely to meet prerequisites + have influence stat boost from having previously held offices. And secondly, because senate just cheats(especially on hard and very hard), giving priority to their own

Maybe it is I who are unlucky with the elections. And have to admit have not checked every time. But I am in 219 with Julii. Every time have checked SPQR have had all the positions of Praetor, Consul, Censor and Pontifex Maximus.

From my understanding of the game's files, I'm not sure what might be causing this issue. It's possible that the map mod you are using might not be compatible with the More Money from Buildings mod. I suggest creating a new save game and testing if the issue persists with one of the mods disabled or contacting the mod creators. Also, verify the integrity of your game files on Steam, maybe a problem has occured during installation.
If you want to check the compatibility of these two mods yourself, your downloaded mods can be found under: Steam/steamapps/workshop/content/(assigned code for TW:RR). Inside this folder you should see the 3 mods you are using. If any of the mods edit the same file, it will likely cause issues because they will overwrite each other.
But as far as this mod goes, it shouldn't cause any of the mentioned issues
Hope you find a solution for your problem!

So i'm only using 3 mods, Imperator map for Vanilla, Roman Senate Expanded, and More Money from Buildings.

It may not be this mod doing it, however I keep getting this bug where when I'm besieging a place, and I right click a unit, or building, while the sieging panel was open, as in the one that says withdraw, attack, or wait, the page that appears from the right click CANNOT be closed, you can right click other stuff, however you cannot close the window, or get back to the siege panel. You also cannot click ESC to bypass this, it result in your only option being to close the game with Task Manager.

Is it compatible with RTR

Thank you for your feedback! It's really rewarding to know that people are enjoying my mod. It can be quite tiresome at times to work on creating them, especially since it's the last year for my law degree but knowing that people find the features useful is what motivates me to create more and expand on what I have already created :)

finally a mod like this, thank you so much!!!

For more context on these positions I suggest checking out Historia Civilis on YouTube

They are partly based on real history, every year 20 quaestors were elected. I settled on 10 because I thought 20 would have been way too much. My reasons for the amount of aedile and praetor positions were similar.
If you need a personal lore explanation about the missing seats, you can justify it by saying SPQR holds them.
As for the election frequency, elections for most positions were held yearly. Since in the game a year is 2 turns, I personally found it too frequent hence the I increased it to every 3 years. Yearly elections made senate mechanics annoying, positions of your family members meaningless and advances through senate positions too fast.
Censors, however, were irl elected for 5 years.
Pontifex Maximus was a lifetime appointment. I could have made the term ridiculously long but there would be almost no chance of player ever getting elected to the title. In game elections from my personal experience are quite random

Are the seat increases/elections based on real history or something else?