While trading with Masons I have set up in an underground trading hall, a portion of my emeralds disappear when placed back into my inventory.

Ex.

Have 49 emeralds

Select quartz block for trade

Purchase 6 quartz blocks, subtracting 6 emeralds leaving me with 43 emeralds

Take emeralds out of trading slot and place back into inventory

18 emeralds suddenly disappear, left with 25

Video showing three separate examples linked here:

https://youtu.be/IPv5rDWdkqU

This is on a multiplayer server running 1.14.2, as far as I know I'm the only one experiencing this bug and could not recreate it with other villager professions.