Here is a sample with a bigger amount of souls. I think I know what the issue is specifically. When you buy from shop using helpers they don't actually decrease unsecured souls (as seen in UI). This leads to any souls you obtain afterwards to be entirely treated as unsecured even if you get them from lane. (Not showcased in clip, but I tested that too)
For example, I should not be dropping 705 on death in the attached clip, and my friend confirmed that it was in fact 705 on his end too. As secure decay would be still ticking I would have dropped less then my entire soul count under normal circumstances. This is not just a visual bug and leads secured souls incorrectly counting as unsecured souls.
As pointed out above, the game corrects itself after a few seconds, but it still leads to more souls counting as unsecured and Rem dropping bigger bags than he should over the course of the game.