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Since no one can know exactly what you did, no one can know what you did wrong.

This has nothing to do with split. When in USB your tx frequency is your VFO frequency + the audio tone frequency.
Do not expect any problems with LoTW or qrz.

14076.5 kHz (+80 Hz) is the frequency where your QSO took place - your exact tx frequency. 14074 kHz was just your selected VFO frequency and this means nothing.

You can test it already from here: https://dl2rum.de/RUMlogNG/RUMlogNG_Test.zip

A basic FTX-1 support will be available in the next version.

When it says there are 334 q's in there but they don't show up, then you have set a filter and the QSOs in question are out of view.

Delete selected calibration file remains grey in File Menu Okay, found it. It will allow calibration files of the same name without warnings. I will add a warning. When you was able to calibrate, does this means all measurements are working? Your feedback is not very clear. Calibration is an option ...

is it possible to filter QSOs by different fields? No, you have to select QSOs in question manually. For more export details see here: https://dl2rum.de/forum/viewtopic.php?p=6216#p6216 How can I update the details in a QSO from QRZ.com? You can use the data prior saving only! for orz you need a ...

Can you select the calibration from the popup in the Stimulus panel?

See Menu-->Window-->Search Entities and make your selections.
You can print nearly all tables in RL. Select a row in the table in question and select Menu-->Edit-->Print. For wide tables it may be required to scale the output in Menu-->Edit-->Paper Format