You can add redirect parameter with login shortcode like the following example.
[wpdm_login_form redirect="https://ferraricontabil.com.br/meus-downloads/"]
One of your plugins or the active theme is injecting irregular <p>
tags in login shortcode content which is breaking the JS http://prntscr.com/pibgak The login issue is coming from there. You can try deactivating other plugins temporarily to check where it is coming from. Let me know the update.
Thanks.