Hi @lisa_vdh
A warm welcome to the forum! Please introduce yourself here when you have some time!
ODK Collect is officially developed and maintained by members of this community.
Kobo Collect is a fork of the official ODK Collect for use with Kobotoolbox.
In terms of the tech stack both projects use similar technologies Javarosa, XForms ....
What issues are you posting, if you post detailed reports the community might be able to assist. If the issues are with Kobo Collect you might get better responses in the Kobo forums