Hi
Sorry to hear this… it sounds a bit like over trained… No expert. Cycling muscle is not the same as running muscle. If you have recovery days, fueling well, sleeping well. Stretching … yes proper stretching after workouts to stop muscle shorting stuff.
So TSS in running different from cycling TSS.
You need to start Low volume and base plans to build into cycling… Have a few weeks complete rest… or very LV 50% to 60% 30 minute rides if you really need too.