As in every random generator, there is always a possibility to get the same tank few times in a row. We get similar reports in the past and decided to make new system in which we generated few milion of extractions. You can check the results here - https://steamhost.cn/news/app/407130/view/3118176606963629205

Originally posted by ego_live:

Bad random. When excavating a tank, there is an 80% chance of getting a T34-76 tank! It's just awful! The game loses all meaning and interest! Is it really impossible to make a normal balance of the probability of tanks appearing? Fix it! I'm on the verge of deleting the game!

When you get the same tank over and over again - just repair the parts that are on the tank (without buying any new ones), then sell the tank for profit. If you keep doing that, not only will you get a fair bit of cash, you'll also force the system to give you a new tank eventually.