Rouge issues w sneak attack and expertise

So I ran into this thing where it just gives me 1d6 For a sneak attack at level seven when it should be 4d6 If it does it at all, I’m having to go in and manually do it all the damn time every time I get a sneak attack.

I also went for the expertise and four different skills so I get double proficiency and it will not do it. The DM says that it will do it, but it never adds it unless I have a manual role and I can go in and add the extra points myself because I currently I get +3, but my expertise would have it as a +6, so I gotta go in and do that

Furthermore, at level seven I get the ability with a rogue where if you roll anything less Than a ten, it automatically becomes a ten.

2024 Revised Rules: If you are playing with the updated Player's Handbook, Reliable Talent is indeed a Level 7 feature.

I have the skill, but it never wants to use it. I always have to remind it, and it fucks up the scenes when I go to change it after it fails to add the roll After a skill check.