Nope. I mean, if your system will be compromised, then IMO 99% of farms will be compromised (knowing how you use your system). So, you don’t need to panic (yet).
It is just how hard you make your setup, and yours is potentially hard enough for now. You may watch this video, to eventually follow what that guy did to create a semi-cold wallet.
As far as any software, it is safe and devoid of any security issues until proven not to be, not the other way around.
The reason I mentioned phones / phone apps is that some / most of those apps include “useful” libraries (ads, stats, …), and those are virtually never scrutinized. Also, websites are compromised day in and day out; however, mostly those that may provide some benefits (extortion, bot installation). Unfortunately, it is really hard to keep a clean website (I also run few, but just pray that those are useless for hackers, and I try to do my best to keep those sites updated).
Two vectors that you have to keep in mind is that your box shares IP connection with the rest of your boxes (thus the entire world), and it has port 8444 open. I would say that for now, those two vectors are maybe not so much impossible, but rather hard enough to crack, to gain too little.
So, the hope is that the culprit will be identified soon, and it is not something really devious.
As I mentioned in the previous post, every time I hear such thing, I am really scared shitless. I posted before my thoughts about cold wallets, and unless someone has a spare box that is never connected, and turns it off after creating a new wallet, there are risks around that. Some people advocate for using VMs, I suggested Live DVDs, and those are also robust ways, but not as secure as such spare box. Still, the way presented in that video is not that far away, at least for now and with setups like yours (clean box, only running chia software).