You are probably worrying too much. Not kneeling will not invalidate your Confirmation or cause the Eucharist to be invalid. It takes a lot more than a few quirks of a parish to do that. The Bishop or priest delegated by the Bishop to Confirm you has a ritual to follow when he confirms. As for the Eucharist, it would have to be invalid matter, a person who is not an ordained priest trying to consecrate, the priest not saying “This is my Body” and “This is my Blood”, or the priest not intending to do as the Church does.
I think sometimes that on these forums we get so caught up in discussing the details of things that we give the impression that one must always be on one’s toes when attending Mass and guard against any liturgical abuse, real or perceived. Some people always seem to be on the lookout for it. This is very unhealthy spiritually. It takes the focus off of Mass, it fosters an attitude of distrust of the hierarchy, it also has led to false accusations and contributes to the distress of scrupulous people. Most of all it takes the focus off of Christ. Please do not fall into that trap–that is not of God. Do not go looking for things to go wrong or be wrong, and remember that minor abuses do not invalidate anything.
Try not to start out as a Catholic with that attitude, it will not enhance your spiritual growth at all. If abuses happen, they happen, and should not occur, but try to remember that we are dealing with human beings here who do love the Lord and sometimes make mistakes and exhibit poor judgment, not malice. Try to look at things through Christ’s eyes–He is forgiving of more than we can imagine, and does not abandon us when we sin.
If there is a serious abuse, such as a priest preaching heresy, or invalid Consecrations, of course it needs to be reported through the proper channels, I am not saying liturgical abuses are ok. I’m just saying don’t put your focus on looking for things you are not aware of.