Do you try to zoom in map?
I see very general picture on your picture. On this scale device not show depth spots and digits on contour. In fishing chart mode the map is overloaded by details. You must remember what in that mode the map is not draw the real data. It is artificially created map using a special algorithm and only based on the real data. Contour of depth be synthesized with maximal frequency for giving better presentation map. You must not use the fishing chart for navigation!!! It is danger!!! But for fishing it is very useful because you have a possibility to visualize the relief of water-body. As well it give me a chance to try to keep the required depth on trolling route. In this case all risk is lost valuable jig spinners