Police were also called to another polling booth earlier today after a Leave campaigner attempted to hand out pens, following fears pencil votes would be erased.
The Leave campaigner claimed someone from the Remain side had called police when he began handing out pens to all voters.
The hastag #UsePens is now trending on Twitter over fears pencil votes for Leave may be scrubbed out.
However, a local council has also warned voters not to use pen, over concerns the ink could smudge.
Midway through polling day, East Northamptonshire Council tweeted: “Please use a pencil on your ballot paper as ink can smudge when its folded which could make the paper doubtful & it may not be counted.”
The confusion caused Manchester City Council and Hillingdon Council, west London, to tweet that pens could be used, while Sandwell Council, near Birmingham, told voters they could bring a pen but urged them not to ask staff for one.
East Northamptonshire Council later clarified its initial post, telling people to “feel free to use a pen but make sure it doesn’t smudge when folding so it is clear how you have voted”.
Sussex Police spokesman said: “Police were called to Durnford Close, Chichester, at around 12.25pm on Thursday June 23 by a volunteer reporting a disturbance outside a polling station.
“A PCSO who was in the area went to the scene and spoke with a woman who was handing out pens.”
No offences were committed and it was not being treated as a police matter, the spokesman added.