Question: op command isn't working as expected.

Attached is my sheet. Please have a look.  my_scrach_Sheet.mw

Have a look at the last command of the sheet.

I am trying to extract integrals from the equaions(eq10_1, for example) using 'op', but it isn't working as expected, is it a bug or I am doing something wrong?

Second question: 

I am not been able to do sorting for all these equations, any suggestions?

 

Many thanks!!!

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