[Anti-Cheat Report] Kicked for speed after using /back while /fly still on

In Game Name:

Jdawger​

Short title for your report:

Kicked for speed after using /back while /fly still on​

What client are you using:

1.17.1, no mods, two minecraft launchers open​

Which server were you on:

Main​

Which world were you in:

Rising​

What time did the issues and/or kick take place:

4:07pm CST​

Ping on kick:

31ms​

Code/Codes received:

Speed​

Description of the issue:

Used /back from my vault back to ECCMuseum (both on main - rising world). Immediately held SPACE to fly up after I warped, quickly rubberbanded once and immediately got kicked​

Reproduction instructions:

See above. ECCMuseum coords (aka destination coords) are -6781 22 -12555. Starting coords I am not putting here in public because it is my vault, but can share in private if needed.​

How many times did you recreate this:

Once with this method​

Video evidence:

None sorry​