I had strange things showing up while meditating
Your question is about immersion, so let's address that first:

AN4.41:1.1: “Mendicants, there are these four ways of developing immersion further. What four?
There is a way of developing immersion further that leads to blissful meditation in the present life.
There is a way of developing immersion further that leads to gaining knowledge and vision.
There is a way of developing immersion further that leads to mindfulness and awareness.
There is a way of developing immersion further that leads to the ending of defilements.

Your question can then be understood as asking whether there is bliss, knowledge and vision, mindfulness and awareness and the ending of defilements. If not, then this is not right immersion.
Studying more in the suttas, we read that immersion is preceded by seven other steps. We must therefore ask ourselves if those steps have been followed:

AN6.63:13.1: And what is the cessation of sensual pleasures? When contact ceases, sensual pleasures cease. The practice that leads to the cessation of sensual pleasures is simply this noble eightfold path, that is: right view, right thought, right speech, right action, right livelihood, right effort, right mindfulness, and right immersion.

And yet even the first step is mysterious. What is right view?

SN45.8:3.1: And what is right view?
Knowing about suffering, the origin of suffering, the cessation of suffering, and the practice that leads to the cessation of suffering.

These are the four noble truths. Without knowing the four noble truths, we fall into wrong immersion.
Keep studying the suttas. Keep meditating. Find a good teacher. Be a good person.