Hello,
Some of the lines in your vifmrc which were derived from sample vifmrc of Vifm prior to v0.14 are relying on a bug which will be fixed in a future release. You need to update the file now to not have issues in the future.
Do :edit $MYVIFMRC and append != '' to lines which look like if $something. Looking at changes here might help as that's how I fixed the sample vifmrc.
Relevant GitHub issue.