Watt output so low

This is the second time I’ve tried Zwift. As before I connected all the sensors. I’m using a dumb trainer - Cyclops Supermagneto Pro - and even though I’m pedalling hard, the watts are consistently low. After the Zwift session today, I did a Trainer Road workout - same effort, and the watts were instantly doubled. What’s going wrong with the Zwift set-up I have?

Can you give us a complete rundown of your setup, the more detail the better.

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Cyclops Supermagneto Pro, speed sensor, cadence sensor and HRM, all connected to Zwift via my laptop. As a comparison, I did 4 miles, 12.5 mph, 55W for a 20-minute introductory session on Zwift, then went straight back to Trainer Road: 7 miles, 14.4 mph, 110W for a 30-minute session.

OK, sped is irrelevant.

It would be hard to know which is correct.

What trainer are you selecting in the Zwift Pairing Screen and what tire size?

Please only reply from one account.

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I select the Cyclops Supermagneto trainer on the pairing screen. The tyre is 700 x 25

What size tire do you have on the bike on the trainer?

Are you using a trainer tire?

What PSI is the tire at?

The tyre is 700 x 25. It is not a trainer tyre. PSI is around 90.