The more I look at this I am not sure this is a meteobridge problem. When I look at the default load method https://www.windy.com/station/pws-f075a2d9?35.491,-97.329,8,i:pressure it comes up with the pressure decimal point error. When I use the alternative duplicate method https://www.windy.com/station/madis-F2084?35.491,-97.329,8,i:pressure it is correct. I suspect the error is in Windy. Can anyone else confirm this?
Those are 2 separate stations as far as Windy is concerned. One is the data they get from you via Meteobridge, second one is the data they get from you via CWOP. Data is sent to CWOP correctly, therefore Windy gets it correctly. Data is sent directly to Windy (probably) via an incorrect conversion from PA to hPa. The conversion error I understand, cuz how often do you deal with barometric pressure in Pa??
They are both sent from a single source my meteobridge. All data sent is from that one source.
We know they're sent from the same physical device, however there are 2 completely different paths the data takes to get there. At the start of the path, pressure is saved as mb/hPa. When data is set to CWOP, its sent as mb/hPa so the number is just read from wherever its stored at. This new path to Windy however, the data starts as hPa, but has to be converted to Pa. This conversion rate that is rarely used is where the issue is, and that conversion rate is within the Meteobridge. 1 hPa equals 100 Pa, so 1017.7 hPa should be converted to 101770 Pa, sent to Windy, and then converted back to 1017.7 hPa or 30.05 inHg depending on if you use Imperial or Metric. The likely issue is that the conversion rate being used by Meteobridge is 1 hPa to 1000 Pa, so 1017.7 hPa becomes 1017700 Pa in the Meteobridge before it gets sent to Windy, and windy turns it back into 10177.0 hPa or 300.52 inHg.
This is just theoretically the issue, because none of us have seen the code for Meteobridge or the code that Windy uses. It works when sending from HTTP request, but not from the built in Weather Network. No one that I've seen has complained about sending Metric units to Windy from any other source besides Meteobridge. Occam's Razor says that most likely, Meteobridge conversion from hPa to Pa is the issue.
Also, if you'd like to prove that Windy is the issue, using HTTP service, send some data with pressure in Imperial (inHg) for a little bit, and then switch it to use Metric (mb/hPa). If Windy has no issue receiving either of those units and the data all looks okay from HTTP service, then the only thing left is the conversion used for the built in Weather Network page.