Melee Hits chance to Fortify not being searchable in Trade site

It seems that if I try to look up for a charm that has the affix of chance to fortify on melee hit, it doesn't show on the list of affixes available. The only way I could search for it was to literally search "X charm of the champion" and then find a charm with the affix and then click the affix so that it sorts it by that mod.

Ohh, that worked. That so strange. Usually you have to type the mod with the exact wording.

Thank you!