J-BusinessDirectory - Not all custom attribute values showing in Search Results filter

I noticed an issue with the custom attribute filter values on the search results page.

It appears that not all values from custom attributes are shown.

So lets say, the business listings that were found in a search contain - for an included custom attribute - values such as a,b,c,d,e,f etc. it might only show the first 3 and present them as filter values.

Is anyone else experiencing this issue?

P.S. Checked on 5.7.5 and 5.7.4