Cannot select files with similar names (one name part of the other name)

[oliv5]

I have MBE running with 2 files opened: "aaabbb.cc" and "aabbb.c"
I set g:miniBufExplShowBufNumbers=0.

When I click/double-click/select file "aabbb.c", then file "aaabbb.cc" is opened instead.
I can still open "aabbb.c" using :MBEbp or :MBEbn.

When I set g:miniBufExplShowBufNumbers=1, the issue vanishes.

My MBE config
let g:miniBufExplStatusLineText = ""
let g:miniBufExplBuffersNeeded = 2
let g:miniBufExplUseSingleClick = 1
let g:miniBufExplCycleArround = 1
let g:miniBufExplShowBufNumbers = 0
let g:miniBufExplAutoStart = 1
let g:miniBufExplAutoUpdate = 1
let g:miniBufExplSplitToEdge = 1
let g:miniBufExplTabWrap = 1
let g:miniBufExplMinSize = 1
let g:miniBufExplMaxSize = 3
let g:miniBufExplSortBy = 'mru'