Little bug with the "Default" / "Custom" state in the Building Blocks Editor. Here is how to reproduce:
1) Go to "Building blocks"
2) In the "Signals (Predefined conditions)" select one of the indicators that has a larger group (for example ADX, or OSMA, etc).
3) Now within that group, select one of the entries that still says "Default" and start the editor via the "Parameters" column.
4) Remove some of the Sets in the "Parameter sets" (for example: remove everything except the "All Random" set).
5) Now click the "Apply to all blocks of the same indicator". You will see that (in the background), it jumps from "Default" to "Custom", which is correct. However, if now clicking "Save", it jumps back to "Default" and stays this way. All other blocks in the section change to "Custom", but the one you´ve just edited and although it was changed and saved, stays at "Default", which, of course, is wrong.