Yes i notice that exactly it is thinner weaker no doubt
For me
Years ago, When it sold in the brown glass bottle it was much thicker and very strong
and it is now in transparent plastic bottle lesser strong ,and much lesser thick.

I think there r 2 versions of that glue " ultra hold"
One sold inside USA which is placed ind brown glass bottle which is v flammable and dangerous grade 3 which couldn't be shipped by air. , it was shipped to me by air since years ago but now no

there is lighter version of ultra hold " placed in plastic transparent plastic bottle " which lesser dangerous grade for air transportation but it disadvantage is lesser strong