False Magazine Negative Bug for Workbench

I noticed while in the workbench for a CE Tact Pistol that if you have two attachments that increase the magazine size by the same amount the magazine size will appear as -1 on the new attachment you were looking to equip. I have screenshots. For reference I had the Enhanced Pistol Mag Mod - BFM equipped and was looking at equipping the Deluxe Pistol Mag Mod - Hi-Speed Mag. Also, for reference, both increase magazine size by +2.