I checked Avalon. This game is made on renpy version 7.4.1. This is the reason for your problems. This version of renpy has a lot of bugs and it is not suitable for creating games. On many systems, games made in the new version may work with errors or not work at all. Developers should know and take this into account, as this problem has been known for quite a long time.
The solution to your problem:
1) Download this -
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2) Put you game into renpy sdk folder
3) Run renpy sdk.
4) Choose game (like avalon) in the left list.
5) Build distribution.
6) Choose what platform you need.
Ps: read this -
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