Hello,
In Glyphs 2 Transformation Filter doesn’t change RSB value in Metrics tab.
Can’t reproduce it? can you send me your file?
There are problems with 4 masters. Just created a new file and it acts strangely - adds not 10 but 20 to the right.
And unchecking one of sidebearings changes the value of another.
Do you have components in that glyphs?
It is not the RSB that is broken but the setting of the LSB.