I can see that. Sorry, my bad.
Followup questions:
Is the problem that they don't trust me to not make monsters which are unbalanced / to spite them in the first place or that they aren't able to check my work? If the latter, could letting them see my notes after the session help?
And on the subject of telegraphing, typically my monsters only have one or two unusual abilities, while something like a demon in D&D might have a dozen random powers and immunities. Is a DM really expected to telegraph everything, or is it just something about using "unofficial" material that breeds distrust?