No. Actually it may be better that way!
Both true bypass and non-true bypass have advantages and disadvantages.
True bypass: there is no modification of the signal (advantage). However, having many TB pedals in series will lead to long cables, and they can load the pickup resulting in the often mentioned "tone loss" (disadvantage).
Non-true bypass: a quality non-true bypass circuit often includes a good buffer, which avoids the loading effect of the cables on the pickups (advantage). However, each buffer does not reproduce exactly the input signal (especially true with low quality ones). Therefore, too many in series may lead to tone degradation (disadvantage).
The best of both worlds is then:
- 1 buffered pedal at the beginning of the signal chain, to avoid loading of the pickups
- eventually 1 buffered pedal at the end if there is a long line to the amp
- everything TB in between.
There are of course exceptions, such as the Fuzz Face pedals which (according to the general consensus) do not like buffer pedals or non-true bypass before them, since part of their signature sound and responsiveness to the guitar controls comes from the loading of the pickups.