Unable to 'Submit' transaction while doing a change assignment with changing position

Summary:

User is trying to complete a change assignment transaction. The changes include change in position. However, when he gets to the 'Assignment' details section of the page, makes changes needed (or even if we make no changes) and clicks on 'Continue' the page hangs and we are unable to proceed. What could be the reason? This was working before in Responsive, but we see such issues after transferring to Redwood.

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26B Rewood page

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