Whatever the last satellite and polarity the receiver selected, that is the only thing the Skystar card can receive.
For example, if you tune the receiver to Hotbird vertical, then scan with your Skystar, all it will find are Hotbird vertical transponders.
If you wish to have complete freedom on the Skystar card, one way would be to get LNBs with two outputs...
...connect one output of each LNB to the existing switch and receiver.
...connect the other LNB outputs to a new switch, and then to your Skystar.
Most of us on this forum are in North America and cannot see your Nilesat nor Hotbird, but we do know our switches, LNBs, receivers, cards, and how to connect them.
We are very happy you've joined us and greet you warmly.
Welcome to the forum.! - :up