An orange alert sign is advising that your photo may print blurry. This will occur if you have a lower resolution photo and zoom in too much. Some images will say that right away if they’re too small to begin with.
It’s possible that having that orange triangle won’t affect how you see the card, but from a technical stand point, it’s a good sign that something could be less clear than you wanted it to be. Remember, a printer renders an image differently from a screen/monitor.