Chrome image opacity bug [strange line appears] - html

Question

I am encountering this strange bug. But only in Chrome so far. Firefox and IE11 are doing fine.
The problem is this:
When I hover over an image in my portfolio, the opacity drops from 0.7 to 0.2. When the transition is done, a strange line appears that looks like it isnt affected by the opacity attribute.
System specs:
Windows 7 Home Premium Service Pack 1 // Chrome 38.0.2125.111 m
Screen resolution: 1920 x 1080
Video card: nVidea GeForce GT650m
Here is a link to a demo site.
Here you can see the line in a screenshot:
And here is a working code snippet:
.grid figure {
position: relative;
display: inline-block;
overflow: hidden;
margin: -0.135em;
width: 33.333%;
text-align: center;
cursor: pointer;
}
.grid figure img {
position: relative;
display: block;
opacity: 0.8;
}
.grid figure figcaption {
padding: 2em;
color: #fff;
text-transform: uppercase;
font-size: 1.25em;
-webkit-backface-visibility: hidden;
backface-visibility: hidden;
}
.grid figure figcaption::before,
.grid figure figcaption::after {
pointer-events: none;
}
.grid figure figcaption,
.grid figure a {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
.grid figure a {
z-index: 1000;
text-indent: 200%;
white-space: nowrap;
font-size: 0;
opacity: 0;
}
.grid figure h2 {
word-spacing: -0.15em;
font-weight: 700;
}
.grid figure h2 span {
font-weight: 300;
margin-right: 5px;
float: left;
margin-top: -1px;
font-size: 31px;
}
.grid figure h2,
.grid figure p {
margin: 0;
}
.grid figure p {
letter-spacing: 1px;
font-size: 68.5%;
clear: left;
}
figure.effect-lily img {
width: calc(100% + 50px);
opacity: 0.7;
-webkit-transition: opacity 0.35s, -webkit-transform 0.35s;
transition: opacity 0.35s, transform 0.35s;
-webkit-transform: translate3d(-40px, 0, 0);
transform: translate3d(-40px, 0, 0);
}
figure.effect-lily figcaption {
top: auto;
bottom: 0;
height: 50%;
text-align: left;
padding: 10%;
}
figure.effect-lily h2,
figure.effect-lily p {
-webkit-transform: translate3d(0, 40px, 0);
transform: translate3d(0, 40px, 0);
}
figure.effect-lily h2 {
-webkit-transition: -webkit-transform 0.35s;
transition: transform 0.35s;
}
figure.effect-lily p {
color: #fff;
opacity: 0;
-webkit-transition: opacity 0.2s, -webkit-transform 0.35s;
transition: opacity 0.2s, transform 0.35s;
font-size: 18px;
font-weight: 300;
text-transform: capitalize;
}
figure.effect-lily:hover img {
opacity: 0.2;
}
figure.effect-lily:hover p {
opacity: 0.5;
}
figure.effect-lily:hover img,
figure.effect-lily:hover h2,
figure.effect-lily:hover p {
-webkit-transform: translate3d(0, 0, 0);
transform: translate3d(0, 0, 0);
}
figure.effect-lily:hover p {
-webkit-transition-delay: 0.05s;
transition-delay: 0.05s;
-webkit-transition-duration: 0.35s;
transition-duration: 0.35s;
}
figure.effect-lily p.cursive {
font-weight: 700;
}
<figure class="effect-lily double">
<img src="http://www.baasdesign.nl/projects/Bootstrap/images/5.jpg" alt="img01" />
<figcaption>
<h2><span>Stichting</span>Werkartaal</h2>
<p>Meer in reïntegratie</p>
</figcaption>
View more
</figure>
Any one ANY clue to what this could be?