Ui masking size problems

So im fairly new to Uis with images, i used to main code but i can’t find someone to help me so i decided to learn on my own and before it was jsut using roblox and shapes but now im tryna use images and its realy confusing becouse its not using the whole gui but just a part

So like this its still okay but if i change sizes it becomes weird, like at 0.5 X scale its perfect

but if i change the size to like 0.9 its not working as it should

So the masking is not accurate and its not working as intended, i tried to mess around with sizes and anchorpoints but nothing works so im here

If you need more infos about my properties just ask

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2 hours no reply, thanks ig reply if you got any idea