Confused Over Sample Rate

I posted a few months ago, after seeing the little blue icon in Reaper telling me the audio was being resampled.
I noticed when I plugged the interface in, the icon went away, so I gave it no further thought.

It's now back, and checking the hundreds of transfers I completed, see this is also true for all the files.
My interface is set to 44.1, while the 'request sample rate' is set to 48000.

I assumed this was automatically set by the interface.
If this is so, why are the numbers not matching, and is it a concern?
I record at 24-bit, 48 kHz. CDs are dithered down to 16 bit, 44.1. Most people will not notice the difference, but if your computer can handle it, I would recommend going with the 48kHz
 
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