I found a workaround for this issue. Delete the formula and then just reinsert it via the wizard.
However, I like to have a "master" excel sheet which I copy for every new job I want to fire up. This workaround adds a manual step. Considering I use this tool as to automize my link building as good as possible, I'd consider this as a pain .
Since this is not happening with all the other formulas + API connections, there might be a quick and easy bugfix?
I'd like to point out that your tool is probably the best tool out there. Thanks a lot <3!!!