Yeah, I don't know how they got that way. I don't know bitnami well enough to explain but that is the reason Apache will not start.
That isn't really a Let's Encrypt problem and I've never seen it with bitnami / bncert before either.
If you change it manually it should allow Apache to start. But, if some bitnami config later overwrites it with the same wrong format it will break again.
Maybe another volunteer will have ideas or try a bitnami forum.