If you are using a password manager (e.g. 1Password, LastPass) they inject code into websites and alter the way they look. This has no consequences on the functionality.

If you want to be certain that the form you are entering data into is a DealMatrix server you can check the certificate. 

Check this page on how to do this for each browser: https://www.globalsign.com/en/blog/how-to-view-ssl-certificate-details/

The correct certificate is always issued to either a .dmx.cloud or .dealmatrix.com domain, e.g. screen.dmx.cloud, www.dealmatrix.com,...

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