I already have a support ticket, so I just replied to the existing support ticket email rather than have another one opened.
I did get an email back the other day. They replied:
"Our new Station Dashboard is in final development and going to QA for review next week with a goal to release at the start of August. The new dashboard will allow you to set the type of pressure you are sending for the station, which will help allow users to resolve this issue.
The API team is adding an additional check to the existing platform for your software / hardware combo, to define it as MSLP vs altimeter. This is set to be pushed to production on Monday, July 20th. This took a bit longer, as the team wanted to perform some verification with other PWS users who have the same hardware-software combo before making a wholesale change.
I will provide an update on Monday once this has occurred. Also, We have a separate task to run a script to update all the data you previously sent, which will occur after the update next week is confirmed to fix your pressure issue for new observations."
So, I'll see what happens.