Hello! I'm so sorry this is happening for you. I did a quick search and I believe this may have to do with rendering due to the version of ren'py that we used. This fix was taken from the website : https://www.renpy.org/doc/html/problems.html Do let me know if it helps!
It says: "Older versions of Ren'Py supported a software renderer, but this has been removed.
A small fraction of systems may experience problems when running hardware accelerated Ren'Py games. These problems are often due to buggy graphics drivers, and so your first step to fixing them should be to check for an update to your graphics card drivers.
If upgrading your video drivers does not fix the problem, you should consider switching video renderers, using the following steps.
- Hold down Shift while starting Ren'Py, or press Shift+G once Ren'Py has started.
- From the "Graphics Acceleration" menu that appears, choose the renderer to use.
- Choose "Quit", then restart Ren'Py.
We suggest trying the GL and ANGLE renderers. The GLES renderers may not function on desktop hardware."