Line chart - disappearing points and missing tooltips

Hello, 

Using the line chart with only the markers turned on:

   I'm trying to visualise average revenue (y-axis) against different sales teams (x-axis) split by team memebers (legend). The problem is the visual doesn't seem to render all the data, and omitts data points instead. 

Example 1:

   When I use a slicer to filter the visual on a specific team, I can see more points on the visual than appear in the corresponding tool tips:

   The tool tips only shows 10 team members, when I know the data contains 18 members for this team. Is this a maximum limit?

Example 2:

   Also, when I'm not using a slicer to filter the visual on a specific team, the number of points, and tooltips displayed by the visual drops to only two for the very same team as before:

   I'm not exactly sure what's going on here. Can someone help me understand this behaviour? Also, please let me know if more information would help. 

Kindest regards,

Angus