How can you not say the L in Balm? If I say to someone I want lip bam I'll get funny looks.
Same if I say Sahv instead of Salve
This goes back to regional accents and shibboleths. Where I'm from, for example, Water is pronounced Wadder, with the T extended into a double D sound.
As I said in the accents thread, I'm also from an area that, along with the Mid-Western U.S., is considered to have one of the lightest accent in the U.S. Even then there are little things that make regions sound different from one another.
The other issue at play here is, British English, and American English have different pronunciations, and there are clearly a mix of voice actors from the U.S., Canada, and Europe. Then there regional differentiations between those of the European voice cast.
Machinations. Perhaps the most noticeable things in the whole game with the different VAs sounds as foreign to me as Marquis being pronounced Mar-Kweas, instead of Mar-Ke, but again, just like Machinations, both are valid.
Much like the OP, Markweas (via Final Fantasy XII) used to make me shake my head. Until I looked it up and realized it was actually correct.
Edit: Also, Balm with L is pronounced as Bomb, so it's not really as awkward as just dropping the L all together.