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Yes. It always seemed normal to me when I lived there and really became noticeable for me after I'd left and started to go back for visits.
Many are like that due to being old and can't easily be widened due to historic buildings. Others are built that way to reduce drivers' speed which usually works.
They can say what they like about people in the UK, Ireland, Malta, Cyprus, India, Pakistan, South Africa, Australia, New Zealand, Japan and a few other places driving on the left however accident levels are low in most of those countries.
I read that in pre-car days most countries had horse traffic on the left. Then the vile Napoleon changed sides in places he invaded and the even viler Hitler did the same.
Presumably independent pre-partition Poland was the same.