Visible faint line for 2 minutes and then disappears

I took a test today morning and the second line became visible immediately. It stays visible for more then 2 minutes and then 15 second to 3 minutes time that the test requires, it disappears.

With my previous pregnancy, once the second line was visible on frers, it stayed visible.

Is this normal or it is a faulty frer?

See below the pictures taken at 7.30; 7:32 and 7:33.