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What kind of device are you playing on? I've read that the current version of Ren'Py doesn't display properly on certain types of devices, but the details were vague beyond "newer Samsung devices". I only have one device that I can test on, and I don't ever get the newest phone...

its a galaxy A20 a Samsung 

That looks like it might qualify as a newer phone. Based on a quick search, that was released in 2019, while my phone was first released in 2017. So it's probably part of the issue that was mentioned in the thing I read, which means it will hopefully be fixed in the next Ren'Py release. On the downside, this means I can't actively do anything to fix the issue myself, since I'm not familiar with the code Ren'Py uses to make Android files. I may have to figure out a way to re-build the APK version of Demo v5 once the Ren'Py update fixes the issue.

how long would that take aprox

I'm afraid I can't really give an estimate unless I know when the next update for Ren'Py will be stable. I think there may be a prerelease version now, but it's not usually a good idea to release games made with a non-stable version of the engine. I also can't be sure if the fix works until I put out the new build, since I don't have any other devices to test on.

Short version: Depends on when Ren'Py 7.4.3 comes out and whether or not it actually fixes the issue with Samsung displays.