The htaccess provided by Wackwiki was kept original. Therefore, there is no way I could have caused the problem myself, it simply occurred while I was away. Because all I did was install Wackowiki, configure it and close it in maintenance mode, in the following days I had logged in several times with maintenance mode activated. All I can say about what happened is that I had a problem, which was somehow resolved, but the cause is still unknown, this is unfortunately still a fact.
Anyway, I appreciate your attention, few people bother to do this.