I can’t see your pics but given the steep angle of these extensions, there shouldn’t be any confusion. Even without seeing the pics, I’m assuming your LBS probably set them up to look like normal ski bends.

These aerobars are so steep that with those flat pads, it looks like the bike shop just went with the standard type installation. If you turn them around, it looks more like a praying mantis position that may require some elbow type cups at the bottom rather than these flat pads.

I think those line markings are a confirmation that it is where they were designed to be inserted on the bike.

I guess the main question here is - which position do you prefer and what is the fitter recommending?

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Dealt with this same thing when I got mine installed at a bike shop. The ones in your picture are installed backward. The longer end should be pointing upward and not in the clamps.

The product photo makes them look like insert stripes not saw off stripes

Long and flattish is more typical but short and high (Landis style mantis) is quite popular in english tt racing. USE is an english brand right?

The pads would make one mount way more comfortable than the other.

The bars might have reinforced carbon at the inserts/clamps and less by the shifters making them one insert style only

They are installed wrong.
High rise installed as low rise.

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