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The issue corresponds to this forum discussion.

It can be reproduced by the following test case:

    @Test
    public void testNumericalNoiseAtIntervalEnd() {

        Frame eme2000 = FramesFactory.getEME2000();
        TimeScale utc = TimeScalesFactory.getUTC();
        final AbsoluteDate initialDate   = new AbsoluteDate(2011, 5, 11, utc);
        final Orbit orbit = new EquinoctialOrbit(new PVCoordinates(new Vector3D(4008462.4706055815, -3155502.5373837613, -5044275.9880020910),
                                                                   new Vector3D(-5012.9298276860990, 1920.3567095973078, -5172.7403501801580)),
                                                 eme2000, initialDate, Constants.WGS84_EARTH_MU);
        Propagator propagator = new KeplerianPropagator(orbit);
        double base  = 3600.0;
        double noise = FastMath.scalb(base, -60);
        // introduce some numerical noise by using two separate shifts
        AbsoluteDate finalTime = initialDate.shiftedBy(base).shiftedBy(2 * noise);
        AbsoluteDate eventTime = finalTime.shiftedBy(-noise);
        propagator.addEventDetector(new DateDetector(eventTime).withMaxCheck(base).withThreshold(noise / 2));
        SpacecraftState finalState = propagator.propagate(finalTime);
        Assert.assertEquals(0.0, finalState.getDate().durationFrom(eventTime), noise / 2);

    }