That looks a lot like differential charging, so I would expect that there are zones/domains/grains/... in your sample which are not in sufficient electrical contact to each other, so that some of them emit electrons regularly while others emit vastly different.

Maybe two of these four peaks represent the actual situation in the sample, but that's hard to tell.

Do you have access to a setup with an electron flood gun?

The two peaks at 290 and 293 eV correspond to the K 2p orbitals. If you check the wide scan you should see the K 2s peak around 380 eV.

Clear evidence of K in sample. As stated already, its the K 2p doublet