IF overload ?

If I increase span to 500KHz or more, this warning disappears. But also I see different noise level on left and right part of the screen (>10MHz and <10MHz different RF path are used).

It looks like the span less than 200KHz tries to use only single RF path (looking at noise, imho this is >10MHz path, it has less noise), and in this case something strange happens with overload warnings.