I've noticed interesting behavior as well, without using a saved preset.
Mags are loaded in incorrect patterns in incorrect amounts - it's not possible to stagger 1/1 BS and PS 545 for example - it just mixes in the two rounds with odd remainders. Using 15 BS and 15 PS, yet I'm notified that I need to buy 4 more rounds of BS, or I see 4 rounds left from 15...
However if I'm using ammunition that I have in abundance - the problem is not really apparent unless I'm paying attention and counting rounds in my stash. Mags load when you press the button - they just load incorrectly it seems.
fresh install of 3.8.0 / new profile
All mods freshly downloaded 2 days ago, all 3.8.0 friendly
SVM / (stacks and any other settings about ammo left alone)
LiveFleaPrices
HealthPerLevel
MoreCheckmarks
AmmoStats
AllTheLoot, Amands graphics, waypoints, Boss Notifier, Rai's HiddenCaches...