In general, it is best to control a single servo with a single node. Rather than have multiple servo nodes with different values, change the value for a single node. A big problem with multiple nodes that you enable/disable is that servo will “float” when they are all disabled rather than hold it’s last position (besides the risk of having 2 servo nodes active at the same time, as you are doing here since your delays add up to more than 6 seconds, so you are starting next pulse before previous one finishes).
One possibility for changing input values is to use a select node:
You can expand the select node and add more delays to trigger additional positions settings. In this case, if your delay nodes add up to more time than your clock pulses, you will jump between settings rather than try to position the servo in two locations at the same time.
If you really want the servo to float for some amount of time, you can link delay-ACT to ‘not’, then to servo-ACT so that servo will be disabled while that delay is active, while still only using a single servo node with changing input values.