Cannot access value from Mirth Connect server's globalMap

Question

My Mirth Connect server contains many fields in its globalMap, and they are visibly present via an up-to-date dashboard view. I ensured it's updated by clicking Refresh as well as re-connecting to the server via Administrator. The problem is that when trying to get these fields from a channel via globalMap.get(...), the function began suddenly unexpectedly returning null

This keeps occuring when trying to get other variables - whose values are plainly there upon navigating manually to the globalMap fields - and happens in any channel I invoke from. Interestingly, after appending a new field to globalMap once with globalMap.put(...) once, that value is successfully returned upon retrieval

Could I be seeing an out-of-date dashboard view of the global map whose previous data was somehow wiped? Could restarting the server help?