At Sylabs, we are firm believers of the open source development and support model. You can receive best effort based support by joining our user communities here: https://www.sylabs.io/singularity/community/
If you believe identified an unexpected behavior which does not compromise the security of the software, please submit an issue on GitHub. Our development team will assign a priority to your report and we will release an update including the fix as soon as possible.
If you think that the bug you identified may have security implications, do not post it publicly! See our security policy page.