Have you changed the details in the tool first? Change the text, font, etc and then right click a text screen to "update" it with the new settings you've specified.

Yes

I'm unable to replicate this issue. Can you please provide a step by step guide on how to reproduce this? Map, gamemode, any other addons, all your textscreen settings, etc.

Well first off.. I know that my addons aren't causing it. The map is rp_downtown_v4c_v2, Gamemode is DarkRP, and my settings are default.

I assume you've removed all other addons and tested the addon standalone to remove that possiblity?
It's really hard for me to be able to help without a specific step-by-step way to reproduce this. Specific text screens settings, the font, text, etc you're using originally, what you're using when you right click, etc.

All fixes have been pushed.

Unfortunately the change in network libraries and data storage has resulted in all perma text screens having to be recreated. This shouldn't happen again in future, and my apologies for any inconvenience.