circ_otest

[AoibhinnR]

I am experiencing difficulties with the circ_otest function from the MATLAB toolbox CircStat.
When I plot my data in rose plots (using circ_plot), some distributions are clearly not uniformly distributed, yet the p-values returned indicate otherwise. In some cases I even receive negative p-values.

The data sets I am using are vectors with elements valued between 0 and 2pi. Is this kind of data compatible with circ_otest?

I have received negative p-values for data sets of varying lengths, from a couple hundred to 3000 elements.
An example of a data set that returned a negative p-value is a 1x130 vector containing:
6.01451654768891
4.32403712099260
5.21684837515172
4.18070819501972
5.03670475395513
5.31324003434995
3.94030265026515
1.82488379464338
3.73334747195356
1.47279329066251
3.94874492084448
2.37507150358792
4.29377574608655
2.81218293845612
2.32287456810880
2.65738387762363
4.48403532935285
1.12588869666223
0.926206599066319
2.40313063541529
3.99091337667184
5.41131042292540
4.49678948455011
1.95904975851212
4.45157751480363
3.34575660941502
0.526499599839838
6.12110830011562
3.92184254060663
1.69617461894012
3.93113175633738
1.94783856959759
3.68606721438283
3.10085153848559
5.21033594276923
2.12629648474751
5.68551646088690
3.94525589055462
0.607266621183555
5.63099183692555
2.87335247043234
1.45754141922038
0.980314495919515
2.68372705761203
3.09033123499978
0.0750842350667540
3.55284948656919
4.46751198647365
1.12285060622600
3.89609523706065
3.36728178100282
0.0806915921298241
0.826375458878943
3.56664088580288
6.13839389318758
1.33371542013185
5.72890559881921
0.158721580059478
2.85698844106946
4.83827161284569
0.582398638098653
4.61883057847524
4.97061752226273
3.49730105109427
1.41024754968538
5.02138486798737
5.38558740615395
3.66466939651053
3.83841207675448
4.81214115722014
6.14149605841737
4.35200963374200
1.52028067156880
2.93953003268518
1.76546766644037
1.51339180986884
5.99094413010153
6.05127006002465
4.50097934450639
3.80192741517237
2.48868405891653
0.215341461403796
3.16312679973021
4.08670240086167
3.01592894744613
3.44117752004024
5.15771783591924
0.616986132368311
2.70088827332665
2.13486650533810
1.49211079651013
0.909901090372159
4.71426120485046
3.30018266735272
4.52987193234890
3.33591797236863
6.27920608912575
4.14068572363613
4.02050870091534
1.94335699404758
2.85496475242201
0.949022780771998
2.32587253233214
1.73763441360882
1.34459444611480
3.02561637756151
5.04496800723041
0.777743210537892
2.10406898277370
1.07897458033654
2.74756238856321
0.643234104147268
1.76643082925807
0.647622667935139
1.51702823736900
3.33362154439601
0.442310970712924
3.05131700262450
1.19314842941230
2.76212037022947
1.57488339442762
4.74329910488336
4.57985304031126
2.58682728420581
5.66167781744503
3.72296470851120
2.22314276415568
2.81276250466340
5.01968762484398
1.51289246219926