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There are several issues that could arise when adding several markers to a Google Map:

1. Clustering: If you have a large number of markers on the map, they can become clustered and difficult to see. This can be addressed by grouping nearby markers together into clusters, which can be clicked on to reveal more information.

2. Performance: Adding too many markers to a map can also slow down the performance of the map, especially on older or slower devices. To address this, you can limit the number of markers loaded at any given time, or use techniques like lazy loading to only load markers as the user scrolls or interacts with the map.

3. Accurate Location: If the markers are not placed accurately, it may misguide the users who are trying to navigate through the map.

4. Conflicting Information: Adding several markers on a map can lead to conflicting information, and this can result in confusion. For example, if two markers are in close proximity but have different information, a user might not know which one to choose.

5. Size of the Map: Adding too many markers may also require increasing the size of the map, which can make it difficult for users to view and navigate.

6. Mobile Responsiveness: The mobile responsiveness of the map should be checked since adding markers to a map may affect the mobile responsiveness of the map.