TVS diodes in series causing a short
The min breakdown voltage @1mA is about 10% more than the standoff voltage for which it is rated in the pn.

So you have two unidrectional TVS's in series with a standoff of 26V+ 14V= 28V and a diode forward drop Vf for each &lt;1V.

Conclusion

Maybe you put them in backwards.  Cathode bar is +ve.

Why you chose these is a mystery .